Comparison

NASA PVT+ vs Sproutkin

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

Head to head
About

NASA PVT+

This app provides a validated tool for conducting psychomotor vigilance tests, crucial for sleep, alertness, and performance research. It offers multiple study frameworks, including simple tests, basic multi-day studies, and specialized aviation research protocols.

Highlights
  • Psychomotor Vigilance Test (PVT)
  • Karolinska Sleepiness Scale (KSS)
  • Sleep Diary
  • Simple PVT mode
  • Basic Study framework
  • Aviation Study framework
Features
Read full description

The official NASA PVT+ (Psychomotor Vigilance Test) is a validated iOS based touchscreen PVT that includes multiple industry standard research forms for collecting a wide range of research data for sleep, alertness and performance studies. The app has three principle data collection schemes designed to accomidate a wide range of research studies. The Simple PVT: The Simple PVT is a single presentation of the Psychomotor Vigilance Test (PVT; described below). Participants can be instructed to take a PVT at any time. There is no limit to the number of PVTs that a participant can take. Basic Study: The Basic Study provides a single or multiday pre-set framework for collecting research data. Participants are prompted to complete a sleep diary after their main sleep episode. The participant is then prompted to complete three PVT and Karolinska Sleepiness Scale (KSS) responses during the day. The participants also complete a sleep diary before bed. Aviation Study: The Aviation Study provides a multiday pre-set framework for collecting aviation related research data. Split into Off-Duty Days and Duty Days. Participants are prompted to complete a sleep diary after their main sleep episode. The participant is then prompted to complete three PVT and KSS responses during off-duty days. On duty days, the participant is prompted to complete a PVT and KSS pre- and post-duty. They are also prompted to complete a PVT, KSS, hassle factors, use of fatigue countermeasures, and inflight rest at the top of descent for each flight. The participants also complete a sleep diary before bed. The number of flights within a duty day can be adjusted. The aviation study also includes a pre-study baseline questionnaires that can be completed at study enrollment. The specific components of the application include: - Psychomotor Vigilance Test (PVT): A simple reaction-timed test that is sensitive to sleep loss and circadian misalignment. The PVT displays a box on the screen and participants are instructed to tap the screen with their dominant thumb when a millisecond counter appears in the box and begins to count up. After the participant taps the screen, the counter briefly displays the reaction time in milliseconds, then the counter disappears, and the participant is instructed to refrain from touching the screen until the next millisecond counter appears in the box. The counter appears randomly every 2 to 10 seconds. The PVT can be configured by the investigator to the desired duration (currently validated for a 5-minute test). - Karolinska Sleepiness Scale (KSS): The KSS is a self-reported sleepiness rating where the participant is asked to rate their level of sleepiness within the last five minutes on a scale from 1 to 9. - Sleep Diary: The Basic Study and Aviation Study each include a sleep diary that the study participant is prompted to complete at the beginning and at the end of the main sleep episode. The pre-sleep sleep diary asks the participant to record any naps that were taken prior to the main sleep episode, along with indicating the time of bedtime. The post-sleep sleep diary asks the participant to record the time that it took to fall asleep, number and duration of night awakenings, final wake time, and a sleep quality rating. - Study Enrollment Information: The Aviation Study includes a demographic questionnaire and the Morningness-Eveningness Questionnaire along with a practice sleep diary and practice PVT to orient the participant to study procedures. Data collected from study participants using the NASA PVT+ iOS application does not include Personally Identifiable Information (PII). Research data is never collected directly by NASA unless a volunteer is participating in a NASA study. Data collected for research studies conducted outside of NASA, through use of the NASA PVT+ application, is never sent to NASA without a specific agreement between the outside organization and NASA.

About

Sproutkin

This app helps new parents track baby activities like feeding, sleep, and diaper changes with a simple, private interface. It allows co-parents to merge logs without cloud accounts and provides insights into sleep patterns and consumable supplies.

Highlights
  • Log feeds, sleep, diapers, vitamins, baths, walks, tummy time
  • Customizable activity tracking
  • Co-parent log merging without cloud accounts
  • Detailed feed tracking with side memory
  • Sleep analytics: total sleep, estimated bedtime, night stretches
  • Consumables tracking for supplies
  • Customizable reminders
Features
Read full description

Sproutkin is a simple, private baby activity tracker built for new parents who want to stay organized without signing up for another account or handing their data to the cloud. TRACK WHAT MATTERS, IN ONE TAP Log feeds (breast, bottle, formula, or solid food), sleep, diapers, vitamins, baths, walks, tummy time, and temperature — plus any custom activity you define. Durational activities like sleep start a timer on tap and stop it on the next tap. SHARE WITH YOUR CO-PARENT, NO CLOUD NEEDED Sproutkin lets multiple caregivers merge logs without any account. Export a .sproutkin file and share it with your partner however you like — AirDrop, iMessage, email. Their app merges it in; both logs stay up to date. FEED TRACKING THAT REMEMBERS THE DETAILS Log nursing sessions and Sproutkin remembers which side was last used, so whoever picks up the next feed always knows where to start. Log solid foods by name and mark any reactions; the Analytics tab keeps a full history of every food introduced and any that caused a response. SLEEP ANALYTICS THAT GO DEEPER Three dedicated sleep cards: total sleep per day, estimated bedtime (derived from your logged sessions), and night stretches — so you can see at a glance whether sleep is consolidating into longer blocks. Customize which analytics cards appear and drag them to your preferred order. SUPPLIES, NOT JUST ACTIVITIES Track when you open a new can of formula, a diaper pack, or wipes. The Consumables tab shows how long your current container has been open and the average lifespan of past ones — a practical heads-up for when to reorder. REMINDERS Set notifications for any activity — a daily vitamin reminder, a feeding window, anything you need. No account required; uses your device's notification system. YOUR DATA STAYS ON YOUR DEVICE Everything is stored locally using Apple's SwiftData framework. No cloud sync, no analytics SDKs, no ads, no subscription. Back up or share your data at any time via a .sproutkin export from Settings.

Screenshots

NASA PVT+4 screens
Sproutkin4 screens

Verdict

The call

The clearest difference is update cadence: Sproutkin at every 6 days against NASA PVT+'s every 3 months. Sproutkin also leads on rating (5.0 vs 4.8). NASA PVT+'s advantage is ratings volume (10 vs 1) and iOS requirement (13.6 vs 18.0). On price, ads, in-app purchases and monetization model 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Sproutkin holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: NASA PVT+ has 10 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

NASA PVT+ ships an update every 3 months, Sproutkin every 6 days. The most recent releases landed on October 27, 2026 and October 18, 2026 respectively.

Scorecard4 real differences · 6 level
NASA PVT+ versus Sproutkin: the parameters behind the verdict, then further details
ParameterNASA PVT+Sproutkin
PriceFreeFree
Rating4.8 (10 ratings)5.0 (1 ratings) — better
Positive reviews25.0% of reviews—
Number of ratings10 — better1
Update frequencyEvery 3 monthsEvery 6 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.6 — better18.0
Further details — not scored
Size31 MB4 MB
Age rating4+4+
DeveloperNASAAddison Chung

Customer experience

NASA PVT+

All ratings10 ratings
Positive90.0%
Neutral10.0%
Negative0.0%
Written reviews4 reviews
Positive25.0%
Neutral25.0%
Negative50.0%

Sproutkin

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

NASA PVT+

No in-app purchases

None

Sproutkin

No in-app purchases

Questions

Is NASA PVT+ free?
NASA PVT+ is free to download, with no in-app purchases.
Is Sproutkin free?
Sproutkin is free to download, with no in-app purchases.
Which has better reviews, NASA PVT+ or Sproutkin?
Sproutkin is rated higher. NASA PVT+ averages 4.8 out of 5 from 10 ratings, while Sproutkin averages 5.0 from 1 ratings.
Do NASA PVT+ or Sproutkin have ads?
Neither NASA PVT+ nor Sproutkin shows ads.
Which is updated more often, NASA PVT+ or Sproutkin?
NASA PVT+ ships an update every 3 months, and Sproutkin every 6 days. Most recently, NASA PVT+ was updated on October 27, 2026 and Sproutkin on October 18, 2026.

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