Calculator vs WhisperDirect
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calculator
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This new calculator has been designed to help you make preliminary calculations in the early stages of designing your armour. It is based on Hudson's internationally recognized formula for designing armour units. Our specialists are committed to sharing CLI's experience with construction companies right from the start of a project, in order to develop the most appropriate tools and methods. As a leader in breakwater protection technologies, CLI offers reliable, cost-effective and durable single-layer solutions to meet the challenges of climate change. CLI is a company fully dedicated to the transfer of single-layer technologies for port structures and for coastal protection. The ACCROPODE™ block and its improved version ACCROPODE™ II, the ECOPODE™ block as well as the CORE-LOC™ block remain market leaders in terms of reliability, ease of installation and productivity. CLI - Concrete Layer Innovations - maintains a strong commitment to sharing feedback on breakwater and coastal protection construction that is constantly fed by our many jobsites around the world.
WhisperDirect
This app converts speech to text and generates summaries using your own API key. It offers cost-effective processing with various AI models and supports multiple import and export formats, including Slack integration.
- Speech-to-text conversion
- AI-powered summarization
- Import audio and video files
- Playback-synced highlighting
- Export to VTT/SRT
- Post to Slack automatically
- OCR transcription from images
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WhisperDirect is an audio transcription and summarization app built around the high accuracy of the Whisper API. In addition to the Whisper API using your own API key, it includes on-device features such as Apple Speech, Speaker Diarization (NVIDIA Nemotron 3), and OCR. For summaries and meeting minutes, choose from OpenAI / Gemini / OpenAI-compatible LLMs, using APIs only as much as you need. One-time purchase — no subscription. Pricing & Experience ・7-day free trial included ・On-device features (Apple Speech / Speaker Diarization / OCR) are free, no API key required ・Whisper API and LLM (Summary / Minutes) are billed by each provider on a usage basis (The app does not charge for API usage) Cost Estimates ・Whisper API: ~$0.006/min (1 hour ≈ $0.36) ・Segment re-transcription (gpt-transcribe): ~$0.0045/min ・On-device features incur no API fees ・Actual costs vary with audio length and settings ・OpenAI API pricing: https://openai.com/api/pricing ・Gemini / custom providers follow each service's pricing ・Locally-run custom providers (e.g. Ollama) incur no API fees Transcription Engines ・Whisper API (OpenAI): high accuracy with your own API key ・Apple Speech (On-device): no API key, iOS 26+ ・Switchable from settings Models for Summary & Minutes ・Choose from OpenAI / Gemini / Custom - OpenAI: GPT-6 Luna / GPT-5 nano / GPT-5 mini / GPT-4.1 nano / GPT-4.1 mini - Gemini: requires Google AI Studio API key (gemini-*-pro / flash / gemma) - Custom: OpenAI-compatible APIs (Ollama / LM Studio / self-hosted) ・Processing costs only a few cents even for several-thousand-character text Key Features ・Record with the mic button and transcribe on the spot ・Live Preview: real-time transcription while recording (on-device) ・Recording display mode switch (Waveform / Simple) ・Import audio files → transcribe (Share Sheet) ・Video import (audio extracted and compressed) ・Transcript auto-highlights with playback position ・Insert timeline markers at any interval (5-sec steps) ・Generate summaries from transcripts ・OCR from images (batch supported, no API fees) ・Generate meeting minutes (prompts editable) ・Re-transcribe misrecognized segments in the editor (Uses OpenAI gpt-transcribe; billed by usage) ・Re-transcribe specific items with Whisper API, even while using Apple Speech ・Speaker diarization (NVIDIA Nemotron 3, on-device) ・Export: Audio / Text / Summary / Minutes / VTT / SRT ・Auto-post to Slack ・Webhook integration (Discord, Slack, n8n, etc.) ・Google Drive auto-backup ・Estimated cost display ・Fine-grained settings (LLM model, timeline interval, prompts) Supported Formats Audio: mp3, m4a, aac, wav, flac, ogg, opus, wma, amr, mpga, webm, aiff, caf Video: mp4, mov, m4v, webm, mkv, avi, mpeg, mpg Notes ・Whisper API requires an OpenAI API key ・On-device features work without an API key ・Prices, specs, and models may change per provider
Screenshots
Verdict
The clearest difference is in-app purchases: Calculator at none against WhisperDirect's 1. Calculator also leads on iOS requirement (15.0 vs 18.0). WhisperDirect's advantage is update cadence (every 4 days vs every 6 months). On price, ads 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. WhisperDirect sells 1 one-off in-app purchase. Calculator asks for nothing beyond the download.
Calculator ships an update every 6 months, WhisperDirect every 4 days. Both last shipped on November 8, 2026.
| Parameter | Calculator | WhisperDirect |
|---|---|---|
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| Update frequency | Every 6 months | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 15 MB | 51 MB |
| Age rating | 4+ | 4+ |
| Developer | CLI - Concrete Layer Innovations | koji ozono |
In-app purchases
Calculator
No in-app purchases
WhisperDirect
- Unlock Full Version$2.99
Questions
Is Calculator free?
Is WhisperDirect free?
Do Calculator or WhisperDirect have ads?
Which is updated more often, Calculator or WhisperDirect?
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