Paresis/Paralysis vs Parallel
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Paresis/Paralysis
This educational app provides detailed visual and auditory learning resources for vocal pathologies like paralysis and paresis. It features videos, animations, and audio clips to help students, patients, and professionals understand and teach these conditions.
- Videos of vocal fold disorders
- Audio clips of patient readings
- Animated vocal fold illustrations
- Structure identification
- Zoom and pan functionality
- Play/pause/stop controls
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The Vocal Pathology: Paresis/Paralysis app helps students and patients learn and professionals teach vocal pathologies. The app features bilateral paralysis, paresis, superior nerve and unilateral videos. Each disorder case includes a key highlight view of abducted and adducted vocal folds. All disorders and normal video include an audio clip of the patient reading the rainbow passage. A normal animated vocal fold illustration, structure ID and three normal videos help patients and students both learn and contrast pathologies against normal vocal folds. Disclaimer: seek a doctor’s advice in addition to using this app and before making any medical decisions. Disclaimer: seek a doctor’s advice in addition to using this app and before making any medical decisions. - Three case examples each for bilateral paralysis, paresis and superior nerve. Four case examples for unilateral view. - Key disorder highlights and videos for bilateral paralysis, paresis, superior nerve and unilateral views. Animated illustration, structure ID and video case examples for normal views - All disorders and normal views include each patient reciting the rainbow passage. This makes it easy to hear the effect of each disorder on the function of the vocal folds. - Videos/animated illustration includes play and pause controls. Audio clips include play, pause and stop controls. - Zoom and pan all disorder highlights, the normal vocal fold animated illustration & structure ID. - All zoom and pan views include an easy reset button. - Optimized for 2nd gen iPad+, requires iOS 6.0+ installed. The Vocal Pathology: Paresis/Paralysis app makes learning vocal pathologies easy. See example screen shots below. Get the app today!
Parallel
Explore historical connections by viewing multiple timelines simultaneously. Discover who lived at the same time as historical figures and events. Create custom collections or use curated ones to delve into specific eras and topics.
- View multiple historical timelines
- Discover contemporaries at a glance
- Access concise biographies with Wikipedia links
- Create custom history collections
- Offline functionality
- Private and no tracking
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Who lived at the same time as Mozart, Van Gogh, or Napoleon? Parallel lays out several timelines at once, and the connections that usually stay hidden appear at a glance. It's your tool for assembling history around what interests you. Ten curated collections come built in, from earth history and the arts to sciences, rulers, empires, buildings, and the events that shaped history. They make it easy to start and give you a taste of what Parallel can do. The rest is yours to shape. For the curious, for the classroom, for everyone who loves history. WHAT YOU CAN DO • Swipe and zoom through the millennia, from antiquity to today. • Line up exactly the collections that fascinate you. • Highlight a person and see their contemporaries at a glance, while everything else fades into the background. • Open any entry for a clear, concise biography or summary, with a link to Wikipedia. • Bring dates and the Wikipedia link straight from Wikidata into your own entry. • Follow a single thread through time, filtered by topic, place, era, and more. • Create your own collections and fill them with what matters to you. • Zoom out from a single year all the way to 13.8 billion years. Every built-in entry is carefully researched, historically grounded, and fact-checked. Try it for free Ancient Rome is included as a ready-made sample collection, no Pro needed. In a few seconds you see how a collection comes together, and it stays with you afterwards. Buy once, no subscription. You buy Parallel just once. The Pro upgrade lifts every limit: unlimited collections and entries, creating and filling your own collections from a spreadsheet or from copied text, your own copies of the built-in collections, and exporting the whole timeline as a PDF. No hidden costs. If you want to go deeper into specific topics, optional premium collections are available. Private and offline Your entries stay on your iPhone. No account, no sign-up, no tracking. The app works offline. Only the Wikidata look-up needs an internet connection. History belongs to everyone, but your data belongs to you.
Screenshots
Verdict
The clearest difference is price: Parallel at Free against Paresis/Paralysis's $4.99. Parallel also leads on update cadence (every 3 weeks vs every 34 months). Paresis/Paralysis's advantage is rating (5.0 vs 4.5) and in-app purchases (none vs 4). On review sentiment, ratings volume 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
Parallel is free to download; Paresis/Paralysis costs $4.99 up front. Parallel sells 4 one-off in-app purchases. Paresis/Paralysis asks for nothing beyond the download.
Paresis/Paralysis 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.
Paresis/Paralysis ships an update every 34 months, Parallel every 3 weeks. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.
| Parameter | Paresis/Paralysis | Parallel |
|---|---|---|
| Price | $4.99 | 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 34 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 11.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 94 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Blue Tree Publishing, Inc. | Anatol Knotek |
Customer experience
Paresis/Paralysis
Parallel
In-app purchases
Paresis/Paralysis
No in-app purchases
Parallel
- Painters & Sculptors XL$1.99
- Buildings XL$1.99
- Science & Technology XL$1.99
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- Parallel Pro$3.99
Questions
Is Paresis/Paralysis free?
Is Parallel free?
Which has better reviews, Paresis/Paralysis or Parallel?
Do Paresis/Paralysis or Parallel have ads?
Which is updated more often, Paresis/Paralysis or Parallel?
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