Comparison

Paresis/Paralysis vs Parallel

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Videos of vocal fold disorders
  • Audio clips of patient readings
  • Animated vocal fold illustrations
  • Structure identification
  • Zoom and pan functionality
  • Play/pause/stop controls
Features
Read full description

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!

About

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.

Highlights
  • 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
Features
Read full description

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

Paresis/Paralysis4 screens
Parallel4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 3 level
Paresis/Paralysis versus Parallel: the parameters behind the verdict, then further details
ParameterParesis/ParalysisParallel
Price$4.99Free — better
Rating5.0 (1 ratings) — better4.5 (2 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings12 — better
Update frequencyEvery 34 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS11.0 — better18.0
Further details — not scored
Size94 MB5 MB
Age rating4+4+
DeveloperBlue Tree Publishing, Inc.Anatol Knotek

Customer experience

Paresis/Paralysis

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Parallel

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Paresis/Paralysis

No in-app purchases

4 purchases

Parallel

One-time4
  • Painters & Sculptors XL$1.99
  • Buildings XL$1.99
  • Science & Technology XL$1.99
Show 1 more
  • Parallel Pro$3.99

Questions

Is Paresis/Paralysis free?
Paresis/Paralysis costs $4.99, with no in-app purchases.
Is Parallel free?
Parallel is free to download, with in-app purchases available.
Which has better reviews, Paresis/Paralysis or Parallel?
Paresis/Paralysis is rated higher. Paresis/Paralysis averages 5.0 out of 5 from 1 ratings, while Parallel averages 4.5 from 2 ratings.
Do Paresis/Paralysis or Parallel have ads?
Neither Paresis/Paralysis nor Parallel shows ads.
Which is updated more often, Paresis/Paralysis or Parallel?
Paresis/Paralysis ships an update every 34 months, and Parallel every 3 weeks. Most recently, Paresis/Paralysis was updated on October 23, 2026 and Parallel on October 24, 2026.

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