Custom Formulas vs CARAPACE
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Custom Formulas
This utility app allows users to create and manage complex calculations with multiple inputs and outputs. Formulas can be linked, grouped into categories, and customized for display precision. Share your custom calculations easily via email.
- Multiple input/output formula support
- Linked formulas via variable names
- Formula categorization
- Customizable variable display order
- Adjustable output decimal precision
- Email formula sharing
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This app is easy to use, but unlike simpler apps, multiple entered values can be fed into multiple formulas and multiple output values can be displayed. The output of one formula in a group can be fed into the next by using the same variable name. Related formulas can be grouped into categories to make them easy to find. e.g. Maths formulas, Surveying formulas, Loan interest formulas etc. The order of variables displayed to the user can be changed, as can the number of decimal digits of precision shown in the output fields. You can easily share formulas with other users of the app by emailing them. Three example formulas are pre-installed with the app. In order of increasing complexity they are: slope percentage, compound interest, and point scale factor.
CARAPACE
Transform your iPhone into a private control surface for your OpenClaw or Hermes Agent. Connect to your Mac gateway to chat, speak, see, and manage projects and tasks remotely from anywhere on your secure network.
- Private control surface for agents
- Chat with personal agent
- Voice and camera context sharing
- Project and agent management
- Run long tasks remotely
- Secure network access
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You already run coding agents on your Mac, your server, your VPS. CARAPACE puts all of them in your pocket, not as another chat app, but as a command surface: your agents stand in line, speak their results out loud, and wait for your word. TALK TO YOUR MACHINES AND LET THEM SEE WHAT YOU SEE! Vision mode intelligently uses built in Apple sensor and AI systems to feed to your agents Voice-first: speak a task, hear the reply, answer hands-free. The mic reopens when it's your turn Auto mode: every lane that finishes work gets its turn to report, like holding court Works from the lock screen and over your music. Replies duck in, music comes back Live captions of what's being spoken, right on the lock-screen card EVERY AGENT, EVERY MACHINE, ONE APP Pair unlimited machines: home Mac, office box, cloud VPS Works with the agent tools you already use: Claude Code, Codex CLI, OpenClaw, and your own custom runtimes Switch machines and lanes instantly; see who's working, who's ready, who's idle Full chat with photos and history when you'd rather type than talk YOURS, ACTUALLY CARAPACE doesn't sit between you and your AI. Your agents run on hardware you control, with your own accounts and keys. The app pairs directly with a small gateway on your machine. One line pasted into your agent sets it up, and a QR code pairs your phone. No middleman servers, no traffic through us. Setup takes about five minutes: carapace.info/setup Requires at least one machine running a supported agent CLI with your own account. CARAPACE Pro subscription: $4.99/month or $39.99/year after a 7-day free trial; auto-renews unless cancelled at least 24 hours before the period ends; manage in your App Store account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://carapace.info/privacy/
Screenshots
Verdict
The clearest difference is price: CARAPACE at Free against Custom Formulas's $3.99. Custom Formulas's advantage is rating (5.0 vs 4.5) and in-app purchases (none vs 6). On review sentiment, ratings volume, update cadence and ads 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
CARAPACE is free to download; Custom Formulas costs $3.99 up front. CARAPACE sells 6 one-off in-app purchases. Custom Formulas asks for nothing beyond the download.
Custom Formulas holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
Custom Formulas ships an update every 5 days, CARAPACE weekly. The most recent releases landed on September 18, 2026 and September 13, 2026 respectively.
| Parameter | Custom Formulas | CARAPACE |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | 4.5 (2 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 1 | 2 — better |
| Update frequency | Every 5 days — better | Weekly |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free — better |
| Best chart rank | #186 — better | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.4 — better | 17.0 |
| Further details — not scored | ||
| Size | 1 MB | 20 MB |
| Age rating | 4+ | 12+ |
| Developer | Anthony Dunk | Michael Paepke Applications |
Customer experience
Custom Formulas
CARAPACE
In-app purchases
Custom Formulas
No in-app purchases
CARAPACE
- Household to Power$2.99
- Household — 5 gateways$4.99
- Power — 10 gateways$7.99
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- Power to Corporate Upgrade$16.99
- Household to Corporate$19.99
- Corporate — 50 gateways$24.99





