Past Code vs Unreal Chemist
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Past Code
Instantly find mark schemes for IGCSE and A-Level past papers by scanning their codes with your camera. Save time and effort by accessing the correct resources directly.
- Scan past paper codes with camera
- Instant mark scheme retrieval
- Supports IGCSE papers
- Supports A-Level papers
- User-friendly interface
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Stop wasting your time and effort looking for mark schemes online. With the help of Past Code, you can use your camera to scan any IGCSE or A-Level past paper code and find the mark scheme associated with it instantly. For further information you can email us at omarayyanapps@hotmail.com or at my personal email omarayyan@hotmail.com A Omar Rayyan Production Copyrighted 2021
Unreal Chemist
Explore a virtual chemistry lab on your phone. Mix chemicals, observe reactions, and conduct over 750 unique simulations with more than 150 available substances. Adjust variables like temperature and concentration to understand chemical principles.
- Mix chemicals for reactions
- Burn salts for colorful flames
- Heat elements for color emission
- Adjust reactant concentration and quantity
- Regulate reaction temperature
- Control time flow (slow/fast forward)
- Monitor pH changes with indicators
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Chemistry experiments on your smartphones. You can Mix chemicals to see how they react, Burn salts to colorful flames and Heat elements to see what colors it emits There are 150 plus chemicals available to experiment with and more than 750 unique experiment simulations. Key Highlights - Adjusting the concentration and quantity of the reactants. - Regulate the temperature of the reaction. - Modify temperatures in precipitation reactions and see the effect of temperatures on solubility. - Slow down / Fast forward time. - Check the PH and PH change in a reaction, using Indicators. - Ignite flammable gases formed during reaction. Disclaimer Some reactions you will be doing in Unreal Chemist are extremely dangerous and may cause serious injury if conducted in real word. Even though most of the reactions are accurate to the real world, some reactions may be theoretical since physical verification of some reactions are not completed as of now.
Screenshots
Verdict
The clearest difference is rating: Unreal Chemist at 4.5 against Past Code's 4.0. Unreal Chemist also leads on review sentiment (73% vs 50%) and ratings volume (67 vs 4). Past Code's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price and device support 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
Both are free to download. Unreal Chemist sells 1 one-off in-app purchase. Past Code asks for nothing beyond the download.
Unreal Chemist holds the better App Store score, 4.5 against 4.0. That said, the two scores are not equally well evidenced: Unreal Chemist has 67 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 50% of Past Code's written reviews are positive against 73% of Unreal Chemist's.
Past Code ships an update every 6 days, Unreal Chemist every 2 weeks. The most recent releases landed on September 26, 2026 and October 3, 2026 respectively.
| Parameter | Past Code | Unreal Chemist |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (4 ratings) | 4.5 (67 ratings) — better |
| Positive reviews | 50.0% of reviews | 73.4% of reviews — better |
| Number of ratings | 4 | 67 — better |
| Update frequency | Every 6 days — better | Every 2 weeks |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 32 MB | 342 MB |
| Age rating | 4+ | 4+ |
| Developer | Omar Rayyan | ZipoApps |
Customer experience
Past Code
Unreal Chemist
Bugs and requests
Past Code
Not enough reviews yet to summarise bugs or requests.
Unreal Chemist
Reported bugs
17 issues- Sulfuric acid not dissolving with salts
- Heating solution during titration
- Watch ad for premium session not working
- Mixing game not always working intuitively
- Buttons on iPhone blocked by camera
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- Some metal flame colors don't match description
- Program sometimes locks up
- Music setting resets after closing program
- Some reactions don't show the full formula
- App crashes on opening
- App gets stuck on the home page
- App kicks the user out
- App opens to a blank grey or white screen
- App won't open
- App crashes when it takes too long to open
- Free version has only 2 reactions
- Interface is buggy (e.g., clicking play sends to home page)
Requested features
32 requests- Add more elements (e.g., Mn, H, O, Cl, F, Pb)
- Add more acids (e.g., Chloroauric acid, Vanadic acid, Perrhenic acid)
- Add more bases and solvents (e.g., styrofoam, polystyrene, ethanol, acetone)
- Add gases (e.g., Chlorine, Fluorine, Hydrogen, Oxygen)
- Option to specify amounts of chemicals to add
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- Kid version with simplified instructions
- Add crafting or new science game modes
- Add more glassware and scientific equipment
- Reintroduce feature to see compound information
- Add challenges or daily missions
- Add ability to use previously made chemicals for new reactions
- Add definitions for elements and reactions
- Add a story or background context
- Add more reactions and compounds
- Add liquid elements (e.g., liquid oxygen, hydrogen)
- Add more bases
- Add more solvents
- Add styrofoam/polystyrene
- Add more elements
- Add more acids
- Add more bases
- Add more solvents
- Add more glassware
- Add more scientific equipment
- Add more reactions
- Add more compounds
- Add more elements
- Add more reactions
- Add more compounds
- Add more elements
- Add more reactions
- Add more compounds
In-app purchases
Past Code
No in-app purchases
Unreal Chemist
- Premium Version$5.99
Questions
Is Past Code free?
Is Unreal Chemist free?
Which has better reviews, Past Code or Unreal Chemist?
Do Past Code or Unreal Chemist have ads?
Which is updated more often, Past Code or Unreal Chemist?
Other comparisons
