# Wispr Flow vs CalStack

The clearest difference is price: Wispr Flow at Free against CalStack's $9.99. Wispr Flow also leads on chart position (#37 vs unranked). CalStack's advantage is in-app purchases (none vs 5) and device support (4 vs 1). On update cadence, ads and iOS requirement there is nothing between them.

Wispr Flow is free to download; CalStack costs $9.99 up front. Wispr Flow sells 5 in-app purchases, starting at $4.49 per 7 days. CalStack asks for nothing beyond the download.

Wispr Flow ships an update weekly, CalStack every 8 days. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Wispr Flow | CalStack |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | **[4.8 (18K ratings)](https://appshunter.io/ios/app/wispr-flow-ai-voice-keyboard/id6497229487/reviews)** | — |
| Number of ratings | **18K** | — |
| Positive reviews | 82.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 8 days |
| Monetization | Free with in-app purchases | — |
| Best chart rank | **#37** | — |
| Size | 182 MB | 22 MB |
| Requires iOS | 18.3 | **18.0** |
| Devices | iPhone | **iPhone, iPad, Mac, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Wispr AI, Inc.](https://appshunter.io/developer/1734170577) | [Pick Two Productions Inc](https://appshunter.io/developer/1860419697) |

## What reviewers say

### Wispr Flow

[App page](https://appshunter.io/ios/app/wispr-flow-ai-voice-keyboard/id6497229487)

**Currently charting:** #37 Top Free · Productivity, #45 Top Grossing · Productivity (US App Store)

This AI-powered voice keyboard transforms your spoken words into polished text instantly, working seamlessly across all your favorite apps. It refines your dictation for speed and accuracy, eliminating filler words and autocorrect errors. Capture notes, draft messages, or transcribe ideas effortlessly, all while sounding natural.

**Highlights:** AI-powered voice dictation, Works in any app, Polished, formatted output, Natural talking input, Customizable personal dictionary, Whisper dictation mode, Quick note capture

**Features:** Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Weekly Plan | $4.49 | per 7 days |
| Monthly Student Plan | $7.49 | per month |
| Pro Monthly Plan | $15.00 | per month |
| Annual Student Plan | $72.00 | per year |
| Pro Annual Plan | $143.99 | per year |

**What reviewers like**

- 🚀 Excellent speech recognition
- 🎉 Life-changing productivity boost
- 👍 Automatic punctuation and capitalization
- ⏱️ Massive time saver

**What reviewers complain about**

- 🐛 Occasional issues with the iOS app

**Reported bugs**

- Dictation immediately erasing in apps

**Requested features**

- Dark mode option


### CalStack

[App page](https://appshunter.io/ios/app/calstack/id6789672345)

**Features:** Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Wispr Flow free?

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

### Is CalStack free?

CalStack costs $9.99, with no in-app purchases.

### Do Wispr Flow or CalStack have ads?

Neither Wispr Flow nor CalStack shows ads.

### Which is updated more often, Wispr Flow or CalStack?

Wispr Flow ships an update weekly, and CalStack every 8 days. Most recently, Wispr Flow was updated on October 28, 2026 and CalStack on October 24, 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.*