# FastCalc lite vs OneAnswerAI

The clearest difference is in-app purchases: FastCalc lite at none against OneAnswerAI's 7. OneAnswerAI's advantage is update cadence (every 9 days vs every 5 months) and iOS requirement (15.1 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. OneAnswerAI sells 7 in-app purchases, starting at $5.99 per 7 days. FastCalc lite asks for nothing beyond the download.

FastCalc lite ships an update every 5 months, OneAnswerAI every 9 days. The most recent releases landed on September 16, 2026 and July 17, 2026 respectively.

## The numbers

| Metric | FastCalc lite | OneAnswerAI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (15 ratings)](https://appshunter.io/ios/app/fastcalc-lite/id432417448/reviews)** | — |
| Number of ratings | **15** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 9 days** |
| Monetization | Free | — |
| Size | 9 MB | 45 MB |
| Requires iOS | 26.0 | **15.1** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 9+ |
| Developer | [Andre Ponzo](https://appshunter.io/developer/350419997) | [VALENTINO PAULON](https://appshunter.io/developer/1861136644) |

## What reviewers say

### FastCalc lite

[App page](https://appshunter.io/ios/app/fastcalc-lite/id432417448)

This calculator app offers a streamlined experience with large, easy-to-use keys and a permanent display of your calculations. It automatically shows results as you type, eliminating the need for an equals button.

**Highlights:** Large, easy-to-read keys, Permanent expression display, Automatic result display, Gesture-based interface, Integrated help videos

**In-app purchases:** none


### OneAnswerAI

[App page](https://appshunter.io/ios/app/oneanswerai/id6756519049)

**Features:** macOS Compatibility

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Pro | $5.99 | per 7 days |
| Monthly Pro | $17.99 | per month |
| 10 Text Queries | $0.99 | one-time |
| 5 Text + 1 Media | $1.99 | one-time |
| 5 Media Queries | $1.99 | one-time |
| 50 Text Queries | $3.99 | one-time |
| 100 Text Queries | $6.99 | one-time |


## Frequently asked questions

### Is FastCalc lite free?

FastCalc lite is free to download, with no in-app purchases.

### Is OneAnswerAI free?

OneAnswerAI is free to download, with in-app purchases available.

### Do FastCalc lite or OneAnswerAI have ads?

Neither FastCalc lite nor OneAnswerAI shows ads.

### Which is updated more often, FastCalc lite or OneAnswerAI?

FastCalc lite ships an update every 5 months, and OneAnswerAI every 9 days. Most recently, FastCalc lite was updated on September 16, 2026 and OneAnswerAI on July 17, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*