Notable changes to this application:

[0.9.7.3] 2026-05-24 (GMT)
# Changed
- Application: Minor bugfixes.
[-] 2026-05-18
# Changed
- Application: More application server performance improvements.
[-] 2026-05-09
# Changed
- Legal: Licenses: Removed Polyfill.io. Revised initial wording.
[0.9.7.2] 2026-05-08 (GMT)
# Changed
- Application: Performance improvements to application server(s) and load balancer. No change in functionality.
- User manuals: Application version, manual(s) date.
[-] 2026-04-26
# Changed
- Utilities: Changed name of SFR(Down/Up) calculator to SFR(Down/Up) [GF 0]. Revised equation.
- Settings, Summaries, and Utilities User Manual: Updated image of Utilities page.
# Added
- Utilities: SFR(Down/Up) [GF 0]: Display calculated ratio.
[0.9.7.1] 2026-04-15 (GMT)
# Changed
- Dashboard inputs: Harmonized limits on decimal places with updated limits table in Dashboard user manual.
- User manuals: Version, date. Dashboard: updated input limits.
[-] 2026-03-22 (GMT)
# Changed
- Home page and linked non-Dashboard pages: Minor page styling tweaks.
- Dashboard: Minor performance tweaks.
[-] 2026-03-19
# Changed
- Dashboard: Fixed display of numerical output cells in mobile browsers.
[0.9.7] 2026-03-16 (GMT)
# Changed
- Dashboard input: Changed limits on slope angle.
- Dashboard output: Friction calculation adjustments, and minor bug fixes.
- User manuals: Version, date. Dashboard: updated input limits.
- Multiple pages: Fixed font styles.
# Added
- Settings user manual: More info about the calculation of Ball-Green COR.
[0.9.6.2] 2026-02-27 (GMT)
# Changed
- Dashboard output: Performance and wind-related improvements.
- User manuals: Version, date.
[0.9.6.1] 2026-02-23 (GMT)
# Changed
- Settings C,S,G: Renamed "Temperatures" section to "Air". Replaced "Dew Pt. Temp. (°F)" with "Humidity (%)".
- User manuals: Version, date, and in settings manual: replace dew point temperature with humidity.
[0.9.6] 2026-02-18 (GMT)
# Changed
- Adustments to wind-related calculations.
- Dashboard: Increased input wind speed limit to 25 mph.
- User manuals: Version, date, and wind speed updates.
[0.9.5] 2026-02-01 (GMT)
# Changed
- Minor speed and accuracy improvements in the simulator and the solver. (No changes needed to user manuals.)
[-] 2026-01-08
# Changed
- Dashboard: Allowed another decimal place of precision for many of the inputs. Max GF reduced to 24. Min Overrun changed to -3.
- Settings A,G and Settings C,S,G: Allowed another decimal place of precision for some of the settings. Max GF reduced to 24. Min Overrun changed to -3.
- Dashboard and settings user manuals: Updated limits tables.
[-] 2026-01-05
# Changed
- Books page: Was Book. Page links updated.
- Home page: Revised wording.
[-] 2026-01-02
# Changed
- User manuals: Updated user interface pages.
[-] 2025-12-30
# Changed
- Site: Updated logos.
- User manuals: Updated pages which displayed a logo.
- Home page and How To page: Revised wording.
[-] 2025-12-26
# Changed
- Book page: The first edition of the book is now out of print. Please wait for the second edition.
[0.9.4] 2025-12-25 (GMT)
# Added
- Dashboard: Added Auto SFR mode, which replaces the input slope angle with an input SFR value.
# Changed
- Updated user manuals (minor changes).
[-] 2025-12-22
# Changed
- Book page: This page has been simplified because the second edition of the book is in active development.
- Putt Summary Page: Y-Intercept (Trgt.) value is now displayed when TX is not 0 and the Target Line crosses the y-axis.
# Added
- Q&A page: Link is in the footer.
[-] 2025-12-15
# Changed
- Book page: Updated answer about timing for second edition of the book.
[0.9.3] 2025-12-05 (GMT)
# Changed
- Slight increase of accuracy of Auto solve results at the cost of a slight increase in solve time.
[-] 2025-09-22
# Changed
- How To page: updated Dashboard images, and added mention of Target Angle (TA), and Distance Ratio (DR).
[-] 2025-09-21
# Changed
- Dashboard: Changed display of output TA and DR values, for quicker observation.
- User Manual: Dashboard: updated Dashboard images.
- User Manual: Settings, Summaries, and Utilities: updated Dasboard images.
[0.9.2] 2025-09-13 (GMT)
# Added
- Application: Manual 2 mode: Input DR, SFR and TA values (then Slope Angle, TX, and TY inputs are disabled).
- User Manual: Dashboard: page on "Manual Entry of DR, SFR, and TA", i.e., Manual 2 mode.
- Book page: Q&A item regarding availability of Manual 2 mode.
# Changed
- User Manual: Dashboard: updated graphics related to addition of Manual 2 mode, and new application version number.
- User Manual: Settings, Summaries, and Utilities: new application version number; fixed a misspelling.
- Dashboard: Target line now displayed in all modes in "Outputs - Speed" panel.
- Putt Summary: Fixed display of input mode data.
- Minor bug fixes and speed improvements.
[-] 2025-09-06
# Changed
- Book page: Revised link to new revision of the document presenting beta chapter on lag putting, witn new PuttCalc Training Card 8.
- Book page: Corrected description and link to document presenting beta versions of new PuttCalc Training Cards 9 and 10.
[-] 2025-08-16
# Changed
- Book page: Revised link to revised document presenting beta chapter on lag putting, witn new PuttCalc Training Card 8.
- Book page: Revised link and description to document presenting beta versions of new PuttCalc Training Cards 9 and 10.
[-] 2025-07-28
# Added
- Book page: Errata item announcement that the third printing is now live.
[-] 2025-07-27
# Added
- Book page: Q&A item on too much information in book.
- Book page: Errata item on title and explanation of Chapter 28 (2nd printing).
[-] 2025-07-23
# Changed
- Book page: Revised link again to a new revision of the beta chapter on lag putting.
[-] 2025-07-13
# Added
- Book page: Q&A item regarding using a ramp for determining down/up ratio.
[-] 2025-07-12
# Added
- Book page: Q&A item regarding Android Chrome browser.
# Changed
- User interface: Fixed invalid Javascript code. No changes to functionality.
[-] 2025-07-06
# Changed
- Book page: Revised link to revised new beta chapter on lag putting.
[-] 2025-06-26
# Changed
- Legal page: Added bytedance/sonic. Added some copyright statements.
[-] 2025-06-14
# Changed
- Servers: Upgraded all machines, OSes, and software. Moved them and static assets to a new datacenter. (No changes to PuttCalc interface, version, nor calculations.)
[-] 2025-05-11
# Changed
- User Manual: Settings, Summaries, and Utilities: Utilities page, Settings A,G page.
- Settings A,G page: Wording of footnote.
# Added
- Utilities page: New calculators: A→SFR, SFR→A (SFR is explained in the book).
[-] 2025-05-03
# Changed
- Book page: Added link to new beta content for PuttCalc Training Cards 9 and 10.
[-] 2025-04-11
# Changed
- Book page: Revised link to new beta chapter.
[-] 2025-03-31
# Changed
- Book page: Link to improved draft of new chapter published.
[-] 2025-03-26
# Changed
- Book page: Link to draft of new chapter paused for more research.
[-] 2025-03-21
# Added
- Book page: Q&A items are now dated when added. Going forward, additions to the Q&A items will usually not be added to this Changelog.
[-] 2025-03-16
# Added
- Book page: Description of, and link to draft chapter on lag putting. New Q&A item on second edition of book.
[-] 2025-03-07
# Removed
- From Legal page, and from user interface script: Modernizr.
[-] 2024-11-20
# Added
- Book page: Q&A, and Errata.
[0.9.1] 2024-11-15 (GMT)
# Changed
- User manuals updated per Utilities page additions and software revision.
- Updated and rewrote parts of the home page.
# Added
- Book page: The book Putting Insight With PuttCalchas been published, and the Amazon link provided.
- Book page: Link to purchase PuttCalc Training Cards - Printable Sheets(same images presented in the book).
- Utilities page: Two new calculators: SFR(Down/Up), and S(SFR,A) (explained in the book).
# Removed
- Utilities page: Input x 2, Input ÷ 2.
[-] 2022-09-30
# Added
- Audacity to legal page.
[0.9.0] 2024-09-12
# Changed
- Site brought back online (more than one year later!).
- Revised home page.
- Simplified numerous calculations; returns results even quicker than before.
- Reorganized the Stimpmeter settings. Also, see # Added below.
- Simplified the Utilities page, and added more length conversions.
- Split and rewrote user manual into two, simpler documents, linked on a separate page.
- Improved wind calculations.
- Miscellaneous interface bug fixes.
- Updated the logo.
- Moved the How To section to its own page.
# Added
- Drop Height and Bounce Time to Stimpmeter settings, and Ball-Green COR to Greens - Default settings, to improve the accuracy of calculating rolling friction.
- Slope/Friction Ratio (SFR) to the Putt Summary page. It will be explained in the book.
- A Stimpmeter Data sheet for printing out to record green measurements, linked on the new manuals page.
- A Legal page.
- A book page for a forthcoming book based on PuttCalc.
# Removed
- Removed the captcha required to launch the Dashboard.
- Removed target distance and target cups from outputs, due to potential interpretation confusion.
- Replaced EHSR (Effective Hole Size Ratio) with a Sunk? indicator in the speed outputs on the Dashboard. Both are based on Holmes (1990). Sunk? takes into account slope and ball MOI, as well as speed and location.
- Removed the Buy page linked in the footer.
[-] 2023-08-23
# Changed
- Took site offline for testing and updates.
[-] 2023-08-13
# Changed
- User manual: Tweaks to Putting Tips and formatting; inserted missing Dashboard image.
[-] 2023-07-16
# Changed
- User manual: Corrected Stimpmeter Ball MOI name and units in tables.
[-] 2023-06-04
# Changed
- Privacy page, regarding IP addresses.
[-] 2023-05-06
# Changed
- Home page wording.
[-] 2022-12-06
# Changed
- Page header wording.
[-] 2022-11-19
# Added
- "Share" link to navigation bar, and "Share This Page" to bottom of homepage.
[-] 2022-11-18
# Added
- Twitter link and username to the Contact page.
[-] 2022-11-07
# Changed
- Revised the Buy page for updated version of the Graphical Putting Insightspresentation, which is now available for purchase and download.
[-] 2022-09-22
# Added
- A labeled graphic to the Buy page.
[-] 2022-08-17
# Changed
- Fixed spin setting changing when updating Settings - Golfer.
- Revised portions of the home page and the user manual.
# Added
- Buy page.
[-] 2022-08-15
# Changed
- Revised a couple of putting tips in the user manual, emphasizing practicing distance control before a round.
- Updated TC and DR curves plots in user manual.
[0.8.7] 2022-08-13
# Changed
- Replaced PR on Dashboard with PHEC. PR and PHEC locations on Putt Summary moved.
- Renamed "Speed" section of Dashboard to "Speed+" because it has values for speed plus some putt attributes.
- Revised home page and user manual to show and explain changes to Dashboard.
- Fixed level length output, which broke in 0.8.5.
[0.8.6] 2022-08-12
# Changed
- Solver tweaks, resulting in improved consistency of PHEC (position of hole entry) results for overrun distances less than -2; solver now 17% slower than v.0.8.5 (or 8% slower than v.0.8.4) for these distances.
[0.8.5] 2022-08-08
# Changed
- Simulation speed tweak; now 8% faster.
# Added
- Comment on launch spin in user manual.
[-] - 2022-07-28
# Added
- Comment on dimple pattern imbalance in user manual.
[-] 2022-07-24
# Added
- Clock position graphic in user manual.
[0.8.4] 2022-07-18
# Changed
- Solver consistency improvements.
- Updated example cups curves graphic in user manual appendix.
# Added
- Added PHEC (clock position where ball entered hole) to Putt Summary, and user manual.
# Removed
- Removed comments in user manual regarding EHSR calcs inconsistency.
[0.8.3] 2022-06-28
# Changed
- Tweaked solver to improve consistency of results for edge cases.
- Tweaked EHSR calcs. There is still some inconsistency in EHSR values, but it does not affect line and speed results.
- Added comments to user manual regarding EHSR results, and overrun distances.
[-] 2022-06-16
# Added
- Added a second graph in the Putt Curves section in the user manual.
[-] 2022-06-15
# Added
- Added Putt Curves section under putting Tips in the appendices of the user manual.
[0.8.2] 2022-06-13
# Changed
- Tweaked solver to improve results for some short, shallow putts.
[-] 2022-06-01
- Public release.
[0.8.1] 2022-05-25
# Changed
- Target angle calcs. (simplified and fixed)
[0.8.0] 2022-05-18
- Preview release to reviewers.