# Stackr vs Caliper

The clearest difference is rating: Caliper at 5.0 against Stackr's 4.4. Caliper also leads on in-app purchases (none vs 7) and review sentiment (100% vs 67%). Stackr's advantage is ratings volume (174 vs 1) and update cadence (every 4 days vs every 9 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Stackr sells 7 in-app purchases, starting at $7.99 per 7 days. Caliper asks for nothing beyond the download.

Caliper holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Stackr has 174 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 67% of Stackr's written reviews are positive against 100% of Caliper's.

Stackr ships an update every 4 days, Caliper every 9 days. The most recent releases landed on October 18, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Stackr | Caliper |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (174 ratings)](https://appshunter.io/ios/app/stackr-peptide-glp-1-tracker/id6764821587/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/caliper-glp-1-peptide-tracker/id6781884879/reviews)** |
| Number of ratings | **174** | 1 |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 9 days |
| Monetization | Freemium | **Free** |
| Best chart rank | **#204** | — |
| Size | 88 MB | 43 MB |
| Requires iOS | 17.0 | **16.4** |
| Devices | iPhone | iPhone |
| Age rating | 12+ | 17+ |
| Developer | [Stackr Holdings LLC](https://appshunter.io/developer/1896525659) | [Norman Hamilton](https://appshunter.io/developer/6781884881) |

## What reviewers say

### Stackr

[App page](https://appshunter.io/ios/app/stackr-peptide-glp-1-tracker/id6764821587)

**Currently charting:** #204 Top Free · Health & Fitness (US App Store)

This app simplifies tracking peptide and GLP-1 doses, including supplies like vials and pens. It offers smart reminders, home screen widgets, and visual charts of estimated active levels based on half-life. Designed for users managing peptide protocols, it keeps your dosing information organized and accessible.

**Highlights:** Log peptide and GLP-1 doses, Track vials, pens, and other supplies, Smart reminders for next doses, Home screen widgets, Estimated active level charts, Multi-peptide stack tracking, Reference pages for common compounds

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stackr+ Weekly | $7.99 | per 7 days |
| Monthly | $12.99 | per month |
| Stackr+ Yearly | $29.99 | per year |
| Stackr+ Yearly | $49.99 | per year |
| Stackr+ Yearly | $49.99 | per year |
| Stackr+ Yearly | $59.99 | per year |
| Yearly | $69.99 | per year |


### Caliper

[App page](https://appshunter.io/ios/app/caliper-glp-1-peptide-tracker/id6781884879)

Precisely track GLP-1, peptide, and compound protocols with one-tap logging and visual level curves. Monitor doses, weight, side effects, and progress privately on your device. Includes a reconstitution calculator and provider export.

**Highlights:** GLP-1 & peptide tracking, One-tap dose logging, Visual compound level curves, Weight & BMI trends, Side effect logging, Private progress photos, Reconstitution calculator

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Stackr free?

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

### Is Caliper free?

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

### Which has better reviews, Stackr or Caliper?

Caliper is rated higher. Stackr averages 4.4 out of 5 from 174 ratings, while Caliper averages 5.0 from 1 ratings.

### Do Stackr or Caliper have ads?

Neither Stackr nor Caliper shows ads.

### Which is updated more often, Stackr or Caliper?

Stackr ships an update every 4 days, and Caliper every 9 days. Most recently, Stackr was updated on October 18, 2026 and Caliper on October 6, 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.*