Tony S. wrote:

Atkins since 9/25/10, (181, 173, 160), started with OWL

This is my 2nd time doing low carb. The last time was about 10 years
ago.

Restarting directly in OWL makes some amount of sense. If you followed
the process as written in the book the first time you discovered your
CCLL so you know what carb count to target to be in ketosis. If you
know you should target a typical count like 50 then it can work to go
directly there from the gate.

Often it takes some pressure to get into or out of ketosis. Think of
the snaps on a winter coat. You touch them together and they do not
stick. You push them. They snap together and the do stick. You pull
thhem gentlely and the stay together. You tug them. Theysnap apart and
they no longer stick. This process is called hysteresis and for many
ketosis follows the pattern. There's some resistance to entering
ketosis, there's a snap into it. There's some resistance to exitting
ketosis, there's a snap out of it. Anyways, the fact that it works like
that for a lot of people but not for everyone is in the list of reasons
the first time through the process starts as low as 20. It pushes the
snap into ketosis. It's a deliberate undershoot big enough to have that
pressure like pushing a snap together.

Counting carbs is difficult by hand with a food journal,

It does get easier with practice. I ended up memorizing the foods I eat
most of the time and as that happened I looked up fewer and fewer foods.
I went from weighing foods to learning the size of a weighed portion to
being able to judge by the size. It's a learning curve that gets easier
as the weeks pass.

so I'm
wondering what online carb / macronutrient counters people are using.
I'm looking for one that's accurate, quick, and flexible.

www.fitday.com was a very popular one for a lot of years. It's not low
carb focused so it offers more types of counts and statistics than most
folks ever need. Low carbing tends to focus on gram counts with a
secondary interest in total calories and that means percentages are a
distraction. Fitday gives percentages because there are other types of
plans that do focus on percentages. More numbers than you need can be
confusing until you learn which ones apply and which ones don't. Focus
on the useful ones.