Lullcast vs Sokuyaku
Price, ratings, monetisation and update history for both apps, side by side ā with what reviewers say about each.
Lullcast
Read full descriptionHide full description
Learn while you wind down. Lullcast turns a topic, article, notes, or PDF into a calm audio lesson made for your bedtime routine. Choose the level, length, narrator, and soundscape; Lullcast writes and narrates a personal podcast you can listen to tonight. BUILD A BEDTIME LEARNING HABIT ⢠Create individual episodes or a seven-night series ⢠Pick a topic or add your own source material ⢠Choose a learning level, format, length, voice, and ambience ⢠Listen with a sleep timer, speed controls, and offline downloads ⢠Save key ideas and revisit them with morning recall questions ⢠Track your progress across episodes and series Lullcast uses AI to generate educational narration. Generated content can make mistakes, so verify important information with reliable sources. Free accounts include 15 audio minutes total each month, shared across up to three custom episodes. Lullcast Plus includes up to three custom episodes per night. Subscription pricing and terms appear before purchase. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Sokuyaku
Read full descriptionHide full description
Speak a Japanese sentence and see it in English, Italian, Spanish and German at once, in large, easy-to-read type. Tap the play button on a card to hear it spoken. - Speak, get 4 languages Press the record button and speak Japanese. On-device speech recognition transcribes it, and the moment you finish, all four translations appear. Translation uses iOS's built-in Translation framework. Download the language data once and it works offline. Big, readable text. Tap the play button to hear the phrase in that language. - Save it, look back at night Every phrase is saved by day. Search them, or export as text, Markdown or CSV. At the end of the day you get a short story built from that day's phrases, plus a 5-question quiz (fill in the blank, pick the meaning). Free: once a week. Pro: every day. On devices with Apple Intelligence the story is written on the device. On other devices, or if that fails, only the day's Japanese and translations (text only) are sent to our server and on to an AI model. No audio or device identifiers are sent, and you can turn this off in Settings. Tap "Explain" on a card and an AI breaks the sentence into words, shows polite and casual variants, and adds a one-line grammar note (free: 3 per day). - Free and Pro Speak, translate, listen and save are free with no limit on the number of recordings. Pro gives you a story and quiz every day and unlimited export. AI generation (explanation cards, plus stories made in the cloud) is shared, up to 1,000 a month; if you use them up, you can buy an add-on pack. - Purchases and subscriptions Sokuyaku Pro (Monthly) / Sokuyaku Pro Monthly - 1 month, auto-renewing, JPY 600 per month Sokuyaku Pro (Yearly) / Sokuyaku Pro Yearly - 1 year, auto-renewing, JPY 3,600 per year; eligible new customers get the first 7 days free Sokuyaku Pro (Lifetime) / Sokuyaku Pro Lifetime - JPY 7,800, one-time purchase, does not auto-renew Explanation Add-on (300) / Sokuyaku Credits 300 - JPY 300, consumable; adds 300 more AI uses for explanation cards and stories generated in the cloud, combined, once Pro's 1,000 for the month are used up. They do not expire and carry over to the next month The prices above are those of the Japan App Store; in other countries and regions the price in the local currency is shown on the purchase screen. Payment is charged to your Apple Account at confirmation of purchase. If a free trial applies, it turns into a paid subscription and is charged unless auto-renew is turned off at least 24 hours before the trial ends. A subscription renews automatically unless auto-renew is turned off at least 24 hours before the end of the current period. Your Apple Account is charged the same price for the renewal within 24 hours before the current period ends. You can view, change or cancel a subscription in Settings > your Apple Account > Subscriptions after purchase. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://legal-pages-hiros-projects-fdd12c60.vercel.app/sokuyaku/privacy Requires iOS 26 or later. Speech recognition and translation run on the on-device models in iOS 26.
Screenshots
Verdict
The clearest difference is iOS requirement: Lullcast at 16.4 against Sokuyaku's 26.0. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS
Both are free to download. Lullcast sells 3 in-app purchases, starting at $2.99 per 7 days and Sokuyaku sells 4 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.
| Parameter | Lullcast | Sokuyaku |
|---|---|---|
| Price | Free | Free |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone | iPhone, iPad ā better |
| Requires iOS | 16.4 ā better | 26.0 |
| Further details ā not scored | ||
| Size | 63 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Graphicmade | hiroyuki matsuzaki |
In-app purchases
Lullcast
- Lullcast Plus Weekly$2.997 Days
- Lullcast Plus Monthly$9.991 Month
- Lullcast Plus Annual$69.991 Year
Sokuyaku
- Sokuyaku Pro (Monthly)$3.991 Month
- Sokuyaku Pro (Yearly)7 Days trial$22.991 Year
- Explanation Add-on (300)$1.99
- Sokuyaku Pro (Lifetime)$49.99






