Labster vs Gizmos vs PhET: Ranked for Teachers (2026)

Your district spent $800 on a Gizmos site license. Your AP Chem students use it twice a semester. Meanwhile the teacher three doors down runs PhET for free and her kids ace the same unit tests.

That gap — between what edtech costs and what it actually delivers — is the whole conversation here. Three platforms dominate the virtual lab space for high school science: Labster, Gizmos (ExploreLearning), and PhET Interactive Simulations. They are not equals, and the most expensive option is not the best one for most classrooms.

The ranked verdict: PhET is the default pick for budget public high schools. Gizmos earns its place when a district already owns the license or needs structured, printable curriculum. Labster belongs in AP, CTE, and dual-enrollment settings with actual budget to spend — not in a Title I classroom where the supplies line is $170 a year.

The sections below explain the reasoning, price each tool honestly, and include what teachers in the actual subreddits are saying.

The Ranked Verdict (Read This First)

Three buyer profiles, three answers:

Profile A — Budget public high school, general science through pre-AP Use PhET. It is free, runs on every device including Chromebooks and phones, requires no student accounts, and covers the full 9-12 scope with over 100 HTML5 simulations. The only real investment is teacher time building a good worksheet around each sim. That is time worth spending.

Profile B — Structured curriculum environment, district already owns the license Use Gizmos. The built-in student worksheets and NGSS tagging are real conveniences that save prep time. If the license cost is already absorbed by the district and the alternative is building your own scaffolding from scratch, Gizmos earns its fee. If the district is still deciding whether to buy — run the PhET comparison first.

Profile C — AP Biology, AP Chemistry, AP Physics, CTE, or dual-enrollment with line-item budget Consider Labster. The 3D simulations for PCR, CRISPR, gel electrophoresis, and other bench techniques have no free equivalent at this fidelity. Explicit AP collections exist. The gradebook LTI integration is the strongest of the three. The price is high and opaque, but there is a Title I funding path that districts underutilize.

One thing to name plainly: Labster’s vendor messaging positions itself as “the standard for high school science.” That pitch targets AP and CTE classrooms — not the typical Title I high school teacher managing 150 students, a broken fume hood, and a $170 annual supplies budget. Marketing language isn’t an argument for purchase.

Quick Comparison

PhET — The Free Option That Often Wins

PhET Interactive Simulations comes out of the University of Colorado Boulder. It has been around since 2002 and has outlasted a dozen edtech products that were better-funded and better-marketed. That longevity is not an accident.

The current library has over 100 HTML5 simulations covering physics, chemistry, biology, earth science, and math. Every simulation runs in a browser with no install, no student account, and no paywall. The Google Classroom share button is built in. Chromebook compatibility is full. iPad compatibility is full. The platform is translated into over 120 languages — which matters in classrooms that district procurement departments tend to overlook.

The accessibility work is genuine. PhET has invested in keyboard navigation and screen reader support across its simulation library, making it one of the more practical options among tools built for accessibility and differentiation in a science context.

The weaknesses are real and worth naming. PhET simulations are intentionally open-ended — they don’t guide students through a procedure. That is a pedagogical feature, not a bug, but it means the teacher has to build the worksheet. There is no gradebook, no time-on-task monitoring, no built-in accountability structure. A PhET sim dropped in front of unmotivated students without a well-designed task is just a toy.

The stronger claim is this: PhET isn’t the free version of a real virtual lab. It is a real virtual lab — designed by science education researchers, validated in peer-reviewed studies, and used in university courses. Treating it as a consolation prize for schools that can’t afford Gizmos gets the value order backwards.

One physics teacher on r/ScienceTeachers described it this way: “phet.colorado.edu — I use it all the time in physics; with careful lab design you can illustrate any concept.” That is not a workaround. That is a workflow.

Gizmos (ExploreLearning) — Teacher Time vs. Budget

Gizmos has the largest simulation library of the three: over 400 sims spanning grades 3-12, with the strongest coverage in the 6-10 range where structured inquiry tends to work best. The differentiator is packaging. Every Gizmo comes with a student exploration worksheet, a teacher guide, vocabulary sheets, and explicit NGSS tagging. The curriculum scaffolding is done.

That is a genuine value proposition — particularly for a teacher covering six preps and running a student government club. The time savings from having ready-to-use materials are real, and they accumulate across a semester.

Pricing (as of 2026 — verify at source): roughly $799 per teacher per year for one or two teachers, dropping to around $599 each for groups of three or more. Institutional pricing runs approximately $3.50–$6 per student per year at district scale, though quotes vary. ExploreLearning also maintains a rotating free library that refreshes in January and July — a genuinely useful option for evaluating specific sims before committing.

ExploreLearning cites a 2024 internal survey finding that 98% of teachers would recommend Gizmos. That is a vendor claim from a vendor-funded survey, and it should be read as one. Vendor-published satisfaction numbers are useful context but not independent evidence.

The honest drawbacks: setup time is heavier than it looks. Building a Gizmos unit from scratch — pulling relevant sims, assigning to classes, setting up the grading sequence — takes real effort the first time through. And the structured worksheets that make Gizmos convenient also create an academic integrity gap. A teacher review on Common Sense Education noted that Gizmos “requires a lot of time to set up… unmotivated students can share answers since you can’t monitor time-on-task.” The platform provides no native mechanism to detect whether a student ran the simulation or just copied the answers from a classmate.

The Gizmos-vs-PhET question is fundamentally a trade of teacher time against budget. Gizmos charges for curriculum scaffolding. PhET gives the sim and asks the teacher to provide the scaffolding. For a district with a staffing model that allows deep curriculum prep, PhET is the harder argument against. For an already-overloaded teacher with 30 students and a fragmented schedule, the Gizmos materials package has a legitimate use case.

The calculation shifts if the district is paying and the teacher isn’t — which is often the case, and why many Gizmos licenses exist in buildings where PhET would serve just as well.

Another teacher on r/ScienceTeachers put it plainly: “If you have the money, Gizmos are awesome — they come with student worksheets that lead them through the inquiry.” The conditional at the start of that sentence is load-bearing.

Labster — University-Grade Depth, University-Adjacent Price

Labster originated in higher education, and that lineage shows in every part of the product. The 3D simulations — PCR, CRISPR, gel electrophoresis, spectrophotometry, titration, microscopy — are rendered at a fidelity that has no free equivalent. Students interact with lab equipment procedurally: pipetting, centrifuging, reading instruments. The experience approximates bench science in a way that a 2D browser sim cannot.

The AP Biology and AP Chemistry collections are explicit product lines, not retrofitted K-12 content. LTI gradebook integration with Canvas, Schoology, and other major platforms is full and functional — when a student completes a simulation, the score lands in the gradebook without a manual import step. That is a real operational advantage in high schools running Canvas.

The pricing situation is a legitimate problem. Labster publishes no public price. Community estimates from educator forums place it in the range of $80–$120 per student per year — that is an unofficial estimate based on community discussion and should be verified directly with Labster. For a class of 30 AP Biology students, that is potentially $2,400–$3,600 annually for one course. Quote-only pricing creates a negotiation asymmetry: districts that push back get better rates, and districts that don’t know to push back pay more.

The limitations are worth cataloguing. Customization is constrained — teachers cannot edit simulation variables or build their own lab sequences. Multiple teachers in community discussions have described the animation quality as “dated,” particularly compared to what students encounter in consumer games. Content is designed for university-first use, which sometimes means the cognitive load and vocabulary calibration is slightly above where a 10th-grade honors class is operating.

A teacher on r/Teachers offered a measured take: “My school has it, library’s solid; animations look a bit dated; easy choice IF you’ve got a school subscription — chat with your admin/purchaser.” The emphasis there is on the “if” — Labster is a good product when someone else is absorbing the cost.

Title I funding paths do exist for Labster. The vendor has a Title I purchasing guide and some schools use ESSER funds or CTE grants to cover the cost. That is worth exploring for any qualifying school, but it requires someone with the time and knowledge to navigate the procurement process — which is itself a resource the most under-resourced schools often lack.

For district procurement and AI policy, Labster is one of the more defensible third-party purchases at the high school level — if the AP/CTE use case is real and the budget is available. It is not a general-purpose platform.

LMS Integration, Grade-Level Fit, and Accessibility

LMS integration breaks down by platform: PhET’s Google Classroom integration is the simplest available — a share link that works without any admin configuration. That makes it the default choice in Chromebook-heavy districts running Google Workspace. Canvas users have a better story with Labster, which supports full LTI 1.3 integration including automatic grade passback. Gizmos integrates with most major LMS platforms but the grade sync experience is inconsistent depending on the platform version.

Grade-level fit follows a clear pattern. PhET spans grades 6 through 12 and into introductory college. Gizmos covers grades 3-12 with its strongest curriculum development in the 6-10 range — middle school and standard high school sequences. Labster is optimized for grades 9-12 in AP/honors tracks and community college. Running Labster in a standard 9th grade Earth Science class is paying college-level prices for content calibrated above the audience.

Accessibility is uneven across the three. PhET has made consistent investments in keyboard navigation and screen reader compatibility, documented on the PhET accessibility features page. Gizmos has limited multilingual support, which matters in districts with significant ELL populations — a notable gap given that PhET covers 120+ languages. Labster provides audio narration throughout its simulations, which supports students with reading difficulties, but screen reader compatibility is not well-documented publicly.

The accessibility and differentiation question often gets separated from the virtual lab conversation. It shouldn’t be. For teachers thinking through the full range of learner needs — which connects to how ClassDojo, Remind, and Seesaw compare on communication and differentiation — PhET’s multilingual depth and keyboard accessibility are meaningful advantages that rarely appear in vendor comparison materials.

Which Tool Is Right for Your Classroom?

The three profiles from the top section hold, with one addition worth naming: mixing platforms is legitimate strategy and often the right call.

A reasonable multi-tool approach: use PhET for introductory and conceptual units across standard biology, chemistry, and physics courses. Add Labster specifically for AP Bio and AP Chem labs where bench technique simulation matters — and only if a pilot confirms student engagement. Use Gizmos only if the district owns the license and the teacher values the bundled scaffolding enough to justify the setup time.

That combination covers most of the use cases without paying for Labster across an entire department.

The framing that clarifies the decision: PhET does the job and the budget stays intact. Gizmos is a teacher convenience fee — it buys pre-built scaffolding, and whether that’s worth $599-799 per teacher per year is a function of how much prep time the teacher has. Labster is an AP depth fee — it buys simulation fidelity that genuinely doesn’t exist for free, and the question is whether that fidelity is worth the cost for this specific course in this specific school.

Understanding the problem being solved before purchasing is the discipline that most edtech decisions skip. Pairing virtual labs with thoughtful lesson design — something best AI lesson plan generators for teachers can accelerate — often produces better outcomes than a more expensive platform alone.

What Teachers Are Actually Saying

The community evidence on these platforms is more useful than any vendor case study.

On PhET’s practical value, a teacher on r/ScienceTeachers described using it regularly for physics: “phet.colorado.edu — I use it all the time in physics; with careful lab design you can illustrate any concept.” The phrase “careful lab design” is doing real work there — PhET rewards teachers who build structured tasks around the simulations.

A second teacher in the same community specifically highlighted the device compatibility: “PhET is a godsend when you don’t have the physical setup; HTML5 means it runs on iPads and phones.” In a school where Chromebook carts are the infrastructure reality, that is not a small thing.

On the free-or-paid question, one teacher on r/Teachers offered a practical clarification: “PhET is free; some questions may want an account but you don’t have to pay. I use it regularly.” The no-account-required path works for most simulation use — account creation is optional, not a paywall.

On Gizmos, the consistent praise lands on the scaffolding: “If you have the money, Gizmos are awesome — they come with student worksheets that lead them through the inquiry,” noted one teacher on r/ScienceTeachers. The consistent critique, echoed in the Common Sense Education review community, is the academic integrity gap: structured worksheets that students can share without any way to verify independent work.

On Labster, the teacher on r/Teachers named the product honestly — solid library, dated animations, and a clear “chat with your admin” dependency for access. That framing accurately describes how Labster works in practice: it is not a self-service purchase for most teachers, it is an institutional tool that requires an administrator advocate.

The community evidence across platforms points to one consistent pattern: the free tool consistently earns positive practitioner reviews, and the paid tools earn qualified praise that almost always includes a cost caveat.

For teachers comparing EdTech decisions more broadly — including how tools like Quill, NoRedInk, and Writable for ELA teachers handle the same structured-vs-open-ended tradeoff — the same pattern tends to hold: free tools with good pedagogical design hold up against paid competitors more often than vendor marketing suggests.

Frequently Asked Questions

Is Labster worth it for a budget public high school?

For most budget public high schools, no. The pricing — unofficial community estimates put it around $80-$120 per student per year, which should be verified directly with the vendor — is difficult to justify unless the school is running AP Biology, AP Chemistry, or a CTE program where bench technique simulation is genuinely part of the curriculum. PhET covers standard high school science at zero cost. The Title I funding path is real but requires procurement capacity that many under-resourced schools lack.

What is the difference between Gizmos and PhET?

Gizmos bundles simulations with pre-built student worksheets, teacher guides, and explicit NGSS documentation — the curriculum scaffolding is included. PhET provides the simulation only; the teacher builds the task structure. Gizmos costs roughly $599-799 per teacher per year (as of 2026 — verify at source); PhET is free. The choice is whether the value of pre-built scaffolding justifies the cost.

Which has the best LMS integration — Google Classroom or Canvas?

For Google Classroom, PhET is the simplest integration by a significant margin — the share button is built in and works without any admin configuration. For Canvas, Labster’s full LTI 1.3 integration with automatic grade passback is the strongest of the three. Gizmos integrates with multiple LMS platforms but with more variable results depending on platform version.

Can PhET replace paid virtual lab platforms?

For standard high school science courses — biology, chemistry, physics, earth science — PhET covers the conceptual and procedural simulation needs without a paid platform. The gap is in upper-level lab technique simulation (PCR, gel electrophoresis, advanced microscopy) where Labster’s 3D fidelity doesn’t have a free equivalent. For most teachers, most of the time, PhET does the job.

What’s best for AP Biology, AP Chemistry, and AP Physics?

For AP Biology and AP Chemistry, Labster’s explicit AP collections and bench technique simulations are the strongest option if budget allows. For AP Physics, PhET’s physics simulation library is deep and well-validated — many university physics departments use PhET, and the AP Physics content is fully covered. Gizmos is less developed for AP-level content than either alternative.

Does PhET work on Chromebooks and iPads?

Yes. The full HTML5 library runs in-browser on Chromebooks and iPads without any install or configuration. This is one of PhET’s practical advantages over both competitors — Gizmos has some mobile limitations, and Labster performs best on desktop browsers.

What is the Gizmos price per student in 2026?

Institutional pricing for Gizmos is approximately $3.50-$6 per student per year at district scale, based on available public information as of 2026 — verify at source directly with ExploreLearning, as pricing is quote-based and varies by contract size. Individual teacher licensing runs roughly $799 per teacher per year for one or two teachers.

Which platform is best for NGSS documentation?

Gizmos has the most explicit NGSS documentation built into the platform — each simulation is tagged by practice, crosscutting concept, and disciplinary core idea, with teacher guides that map directly to standards language. This is useful for teachers who need to document alignment for evaluation or curriculum audits. PhET labels simulations by NGSS alignment but without the same granular tagging structure. Labster’s NGSS documentation is weaker for the high school context.

The Verdict: Free Wins for Most Classrooms

PhET wins for most high school science classrooms because it costs nothing and does most of the job. A teacher willing to build a solid worksheet around a PhET simulation can match or exceed the learning outcomes of a paid platform — at zero cost to the department and zero cost to students.

The practical next step: run one PhET simulation in Google Classroom this week. Pick a unit where students have struggled conceptually, find the corresponding PhET sim, and build a structured observation task around it. Evaluate the results before the next budget cycle.

If AP or CTE programming is on the table, request a Labster pilot — not a purchase. A free pilot will show whether the simulation fidelity justifies the institutional cost for the specific courses in question.

Before renewing a Gizmos license, run the PhET comparison deliberately. Identify which Gizmos simulations are actually being used, find the PhET equivalents, and calculate whether the worksheet scaffolding is worth the annual fee — or whether that money funds something the lab room actually needs.

The best virtual lab is the one students actually use — and the one that doesn’t consume the budget needed for real equipment.