Comparison

Who's in Space? vs NextUpReef

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

Head to head
About

Who's in Space?

Discover the current number of astronauts in orbit and their locations. Tap on an astronaut's name to access more detailed information about their mission.

Highlights
  • Real-time astronaut count
  • Astronaut location tracking
  • Detailed astronaut information
  • Data from Open Notify Astros API
  • User-friendly interface
Features
Read full description

Ever wondered who's in space? Quickly find out how many astronauts are in space and where they are during their time above Earth. Want to learn more? Simply tap an astronaut's name! Data provided by the Open Notify Astros API under the Creative Commons Attribution 3.0 Unported License (http://creativecommons.org/licenses/by/3.0/legalcode). Icon provided by Icons8 under the Attribution-NoDerivs 3.0 Unported License (https://creativecommons.org/licenses/by-nd/3.0/legalcode).

About

NextUpReef

This app helps reef tank hobbyists manage their aquarium's health and equipment. It offers AI-powered analysis, parameter logging, smart outlet control, and community insights to optimize tank conditions and simplify maintenance.

Highlights
  • AI Reef Advisor for tank analysis
  • Parameter logging and trend charting
  • Smart outlet control for equipment
  • Neptune Apex integration
  • Tank setup and livestock tracking
  • Smart reminders for maintenance
  • Reef community insights
Features
Read full description

NextUpReef is the reef tank app that keeps your whole system in one place: water chemistry, dosing, equipment, livestock, reminders and AI advice that actually knows your tank. Built for reefers, by a reefer. LOG A FULL TEST IN SECONDS Record alkalinity, calcium, magnesium, nitrate, phosphate, salinity, pH, temperature, ammonia and nitrite. Your last values pre-fill, and every entry is color-coded against your target range as you type. Pick your tank type (mixed reef, SPS, LPS, softie, nano, ULNS and more) for sensible default targets, or set your own. EVERY TREND, TWO SCORES — REEF PULSE See a chart for every parameter with your target range drawn in and water changes marked. Your Reef Score shows how healthy the tank is today; your Stability Score shows how steadily you keep it that way. Tap either score to see exactly what's helping and what's holding it back. REEF AI ADVISOR (PRO) A full analysis of your tank built from your own data: parameters and trends, water changes, livestock, equipment and dosing. See what's working, what needs attention and what to do next, ranked by urgency. Ask Reef AI Chat anything about your reef, check livestock compatibility with the Stocking Advisor, and log results by snapping a photo of your test kit. EVERY DOSE, ONE CHECKLIST The Dosing screen lists everything due today, whether you dose by hand, with your own pump or automatically. Tap Dosed to log it and watch whether alkalinity, calcium and magnesium are holding steady. Choose from 50+ common products with label strengths built in. Pro adds a dose calculator that dials in your daily dose from your own test trend, and a daily dosing reminder at the time you pick. CONTROL YOUR REEF GEAR (PRO) • Neptune Apex: sync temperature, pH, salinity and Trident alkalinity, calcium and magnesium into your logs; switch outlets; run Feed Mode; set heater temperatures; and schedule dosing with a built-in safety shutoff. • Shelly smart plugs: schedules run on the plug, even with no internet. For dosing pumps, each dose is confirmed by power draw and you're alerted if one is missed. • CoralVue HYDROS (early access): cloud-connected readings and control from anywhere. NEVER MISS A WATER CHANGE Schedule water changes and maintenance like filter socks, carbon and RO/DI filters. Reminders arrive inside the notification hours you choose. EVERYTHING IN YOUR TANK — MY REEF Track fish, corals and inverts with care info, plus equipment, lighting schedules, dosing, salt mix, monthly tank photos and what it all cost. NEW TO REEFING? NEW TANK GUIDE Follow six guided phases from setup through cycling, the ugly phase, first fish and first corals to an established reef, with a checklist for each step. LEARN FROM THE BEST TANKS — COMMUNITY Browse the leaderboard and see inside top-ranked tanks: their parameters, salt, lighting, equipment, dosing and water change habits. Compare your tank with others like it. Your tank stays private unless you choose to share it. ON THE BIG SCREEN Pro members can open the web dashboard at portal.nextupreef.com for full-screen charts and a CSV export of their readings. FREE TO START NextUpReef is free to download and use. NextUpReef Pro unlocks AI features, device control, the dose calculator, unlimited tanks and reminders, the web dashboard and more. Every new account gets a 30-day Pro trial with no payment details required. Privacy Policy: https://nextupreef.com/privacy Terms of Service: https://nextupreef.com/terms Questions or ideas: info@nextupreef.com Neptune Systems and Apex are trademarks of Neptune Systems. CoralVue and HYDROS are trademarks of CoralVue, Inc. Shelly is a trademark of Shelly Group. NextUpReef is independent and not affiliated with these companies.

Screenshots

Who's in Space?4 screens
NextUpReef4 screens

Verdict

The call

The clearest difference is review sentiment: Who's in Space? at 100% against NextUpReef's 50%. Who's in Space? also leads on rating (5.0 vs 3.7) and in-app purchases (none vs 2). NextUpReef's advantage is update cadence (every 4 days vs every 4 months) and ratings volume (3 vs 1). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. NextUpReef sells 2 in-app purchases, starting at $4.99 per month. Who's in Space? asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Who's in Space? holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews point the same way: 100% of Who's in Space?'s written reviews are positive against 50% of NextUpReef's.

UpkeepUpdate frequency

Who's in Space? ships an update every 4 months, NextUpReef every 4 days. The most recent releases landed on October 12, 2026 and October 13, 2026 respectively.

Scorecard7 real differences · 3 level
Who's in Space? versus NextUpReef: the parameters behind the verdict, then further details
ParameterWho's in Space?NextUpReef
PriceFreeFree
Rating5.0 (1 ratings) — better3.7 (3 ratings)
Positive reviews100.0% of reviews — better50.0% of reviews
Number of ratings13 — better
Update frequencyEvery 4 monthsEvery 4 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.1
Further details — not scored
Size0 MB59 MB
Age rating4+17+
DeveloperCameron BernhardtAdam Winstead

Customer experience

Who's in Space?

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

NextUpReef

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

None

Who's in Space?

No in-app purchases

2 purchases

NextUpReef

Subscriptions2
  • NextUpReef Pro$4.991 Month
  • NextUpReef Pro$39.991 Year

Questions

Is Who's in Space? free?
Who's in Space? is free to download, with no in-app purchases.
Is NextUpReef free?
NextUpReef is free to download, with in-app purchases available.
Which has better reviews, Who's in Space? or NextUpReef?
Who's in Space? is rated higher. Who's in Space? averages 5.0 out of 5 from 1 ratings, while NextUpReef averages 3.7 from 3 ratings.
Do Who's in Space? or NextUpReef have ads?
Neither Who's in Space? nor NextUpReef shows ads.
Which is updated more often, Who's in Space? or NextUpReef?
Who's in Space? ships an update every 4 months, and NextUpReef every 4 days. Most recently, Who's in Space? was updated on October 12, 2026 and NextUpReef on October 13, 2026.

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