Comparison

ULTRAPEN™ PTBTx™ vs Captain's Log @Life

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

Head to head
About

ULTRAPEN™ PTBTx™

This application transforms your iOS device into a powerful water quality measurement tool when paired with specific pocket testers. It offers wireless data logging, calibration tracking, and exportable reports for various water parameters.

Highlights
  • Wireless communication with pocket testers
  • Intuitive GUI for pairing and calibration
  • On-board database for measurements
  • Data export in .xls, .xlsx, .csv formats
  • Automatic calibration records
  • Supports conductivity, TDS, salinity, pH, ORP, and temperature
Features
Read full description

REQUIRED EQUIPMENT: ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ Myron L® Company ULTRAPEN PTBTX (First Generation Ultrapen; Lot Code Y1930 and earlier) Models: PTBT1; PTBT2 or PTBT3 DOES NOT WORK with Myron L® Company ULTRAPEN PTBTx2 (Second Generation; Lot Code Y1931 and later). INTRODUCTION ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ The ULTRAPEN PTBTX App is a GUI and communication application that, when paired with one of Myron L® Company's First generation ULTRAPEN pocket testers, converts your iOS device into an accurate, reliable, fast and simple to use measurement and data storage device to use in diverse water quality applications. ADVANCED FEATURES INCLUDE: ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ - Wireless communication between the tester and your iOS device means no bothersome wires to interfere with quickly moving from sample to sample and the paired mobile device can be held safely away from the liquid samples being measured. - Intuitive GUI design for easily pairing, calibrating, measuring and recording measurements in the App on-board database. - The database can be sorted, filtered and exported via your devices email App as either .xls; .xlsx, .csv formatted attachments - Automatic records made of every calibration performed on each PTBTX2 pocket tester. WORKS WITH ULTRAPENX2 POCKET TESTERS ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ULTRAPEN PTBT1 (First Generation) - Measures Conductivity, Total Dissolved Solids (TDS), Salinity, and Temperature. ULTRAPEN PTBT2 (First Generation) - Measures pH and Temperature. Can be calibrated using 1, 2, and 3 point calibration options. ULTRAPEN PTBT3 (First Generation) - Measures Oxidation Reduction Potential (ORP) and Temperature. Can be calibrated to one of three different calibration points (80 mV, 260 mV, or 470 mV). The PTBT2 and the PTBT3 Include a sample and hold mode as well as a live measurements mode. ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ Myron L® is a registered trademark of the Myron L® Company, 2450 Impala Drive, Carlsbad CA, 92010-7226 Bluetooth® is a registered trademark of Bluetooth SIG

About

Captain's Log @Life

This utility app allows users to record thoughts via text and voice memos, organizing them in a digital logbook. It also helps track daily goals with a simple list format.

Highlights
  • Text and voice memo recording
  • Organized logbook
  • Daily goal tracking
  • List-based goal management
Features
Read full description

Captain's Log @Life is a utility app to record short thoughts in text and voice memo and access them through the app's log book, as well as keeping track of daily goals, maintained in a list.

Screenshots

ULTRAPEN™ PTBTx™4 screens
Captain's Log @Life4 screens

Verdict

The call

The clearest difference is rating: Captain's Log @Life at 4.0 against ULTRAPEN™ PTBTx™'s 3.7. ULTRAPEN™ PTBTx™'s advantage is iOS requirement (15.0 vs 17.0). On price, review sentiment, ratings volume and update cadence 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

Captain's Log @Life holds the better App Store score, 4.0 against 3.7. Both are backed by a comparable volume of ratings — 3 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

ULTRAPEN™ PTBTx™ ships an update every 5 months, Captain's Log @Life every 7 months. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

Scorecard2 real differences · 8 level
ULTRAPEN™ PTBTx™ versus Captain's Log @Life: the parameters behind the verdict, then further details
ParameterULTRAPEN™ PTBTx™Captain's Log @Life
PriceFreeFree
Rating3.7 (3 ratings)4.0 (2 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings3 — better2
Update frequencyEvery 5 months — betterEvery 7 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPod — betteriPhone
Requires iOS15.0 — better17.0
Further details — not scored
Size9 MB58 MB
Age rating4+4+
DeveloperMyron L CompanyImago Software

Customer experience

ULTRAPEN™ PTBTx™

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Captain's Log @Life

All ratings2 ratings
Positive50.0%
Neutral50.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

ULTRAPEN™ PTBTx™

No in-app purchases

None

Captain's Log @Life

No in-app purchases

Questions

Is ULTRAPEN™ PTBTx™ free?
ULTRAPEN™ PTBTx™ is free to download, with no in-app purchases.
Is Captain's Log @Life free?
Captain's Log @Life is free to download, with no in-app purchases.
Which has better reviews, ULTRAPEN™ PTBTx™ or Captain's Log @Life?
Captain's Log @Life is rated higher. ULTRAPEN™ PTBTx™ averages 3.7 out of 5 from 3 ratings, while Captain's Log @Life averages 4.0 from 2 ratings.
Do ULTRAPEN™ PTBTx™ or Captain's Log @Life have ads?
Neither ULTRAPEN™ PTBTx™ nor Captain's Log @Life shows ads.
Which is updated more often, ULTRAPEN™ PTBTx™ or Captain's Log @Life?
ULTRAPEN™ PTBTx™ ships an update every 5 months, and Captain's Log @Life every 7 months. Most recently, ULTRAPEN™ PTBTx™ was updated on November 1, 2026 and Captain's Log @Life on November 4, 2026.

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