Comparison

PP+ Archimedes Principle vs Bacteria 3D

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

PP+ Archimedes Principle

Features
Read full description

The Archimedes Principle lab uses a laboratory balance, a metal sample, and graduated cylinders containing water and alcohol to investigate Archimedes’ Principle and to use Archimedes’ Principle to determine the mass densities of a solid and a liquid. It is part of Polyhedron Physics Plus, a set of 24 iPad apps for use in the classroom. To see how they work, try the FREE PP+ Newton’s 2nd Law lab. For those who’d prefer to develop their own experiments, the PP Archimedes Principle app features a similar apparatus without lab procedures and other supporting materials. In addition to a 3D simulation that produces realistic data, each lab includes introductory videos, background theory, experimental procedure, analysis and reporting tools, pre-lab quiz, post-lab questions, and teacher support materials. The experimental data produced by the simulations are realistic, including random and systematic errors. These features allow students to use standard data analysis and error analysis techniques to report on their own unique data, just as if the experiment had been performed using hands-on equipment. These labs can serve as replacements for hands-on labs, especially when equipment is not available, or as supplements to hands-on labs. They are also a suitable option for students in distance learning and home school situations. Formative and summative evaluations showed no significant difference in learning between students using the virtual labs and those using hands-on labs. Preliminary results suggest increased learning by students using the virtual labs as supplements to hands-on. Polyhedron Physics was developed by Polyhedron Learning Media, Inc. with partial funding provided under contract numbers ED-07-CO-0040 and ED-IES-11-C-0029 from the Institute of Education Sciences in the U.S. Department of Education through the Small Business Innovation Research (SBIR) program.

About

Bacteria 3D

Explore biology through interactive 3D animations of bacteria in various shapes. This app offers a dynamic learning experience with pre-set views, narration, quizzes, and VR mode. It's designed for students but engaging for all ages.

Highlights
  • Interactive 3D bacteria models
  • Rotatable and zoomable scenes
  • Predefined navigation views
  • Walk mode for exploration
  • Narrations and animations
  • Animated quizzes
  • VR mode support
Features
Read full description

Bacteria Bacteria occur in a wide range of shapes, including spheres, rods and spirals. Explore biology with our interactive 3D animations! Be actively involved in learning about biology by following the latest results of 3D animation. Our 3D scenes have been designed for students between 8 and 18 years of age but can be interesting for everyone. Available languages: English, Deutsch, Français, Español, Русский, العربية, 日本語, 中文, 한국어, Italiano, Português, Svenska, Nederlands, Norsk, Polski, Magyar With the mozaik3D App, available in the App store, you can access more than 1200 similar 3D scenes. Mozaik Interactive 3D Our fully interactive scenes can be rotated, enlarged or viewed from pre-set angles. With the predefined views, you can easily navigate through the complex scenes. Some of the 3D scenes contain a Walk mode, enabling you to explore the scene yourself. Most of our 3D scenes include narrations and built-in animations. They also contain captions, entertaining animated quizzes and other visual elements. The 3D scenes are available in several languages, which also offers an opportunity to learn and practice foreign languages. Usage and navigation Rotate the scene by dragging your finger. Zoom the scene in or out by pinching with your fingers. Pan the view by dragging with three fingers. Tap the buttons at the bottom to switch between predefined views. You can change the language and set other functions in the context menu. The context menu can be accessed by touching the bottom corners. Activate VR mode by pressing the VR goggles icon in the bottom right corner. In VR mode, tilt your head to right or left display the navigation panel.

Screenshots

Bacteria 3D4 screens

Verdict

The call

The clearest difference is price: Bacteria 3D at Free against PP+ Archimedes Principle's $1.99. Bacteria 3D also leads on update cadence (weekly vs every 29 months) and device support (3 vs 1). On ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Bacteria 3D is free to download; PP+ Archimedes Principle costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

PP+ Archimedes Principle ships an update every 29 months, Bacteria 3D weekly. The most recent releases landed on February 1, 2026 and October 15, 2026 respectively.

Scorecard4 real differences · 6 level
PP+ Archimedes Principle versus Bacteria 3D: the parameters behind the verdict, then further details
ParameterPP+ Archimedes PrincipleBacteria 3D
Price$1.99Free — better
Rating—4.6 (58 ratings) — better
Positive reviews—70.0% of reviews
Number of ratings—58 — better
Update frequencyEvery 29 monthsWeekly — better
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPadiPhone, iPad, iPod — better
Requires iOS18.08.0 — better
Further details — not scored
Size111 MB115 MB
Age rating4+4+
DeveloperPolyhedron Learning Media, Inc.MOZAIK Education Ltd.

In-app purchases

None

PP+ Archimedes Principle

No in-app purchases

None

Bacteria 3D

No in-app purchases

Questions

Is PP+ Archimedes Principle free?
PP+ Archimedes Principle costs $1.99, with no in-app purchases.
Is Bacteria 3D free?
Bacteria 3D is free to download, with no in-app purchases.
Do PP+ Archimedes Principle or Bacteria 3D have ads?
Neither PP+ Archimedes Principle nor Bacteria 3D shows ads.
Which is updated more often, PP+ Archimedes Principle or Bacteria 3D?
PP+ Archimedes Principle ships an update every 29 months, and Bacteria 3D weekly. Most recently, PP+ Archimedes Principle was updated on February 1, 2026 and Bacteria 3D on October 15, 2026.

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